Connected AND in SQL acts wierd

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SQL

Trying to find the problem in a large query I've narrowed the cause for unexpected results to a behaviour I do not comprehend.

Stage:

Simple table:

id	voucherid	orgid	perid	listtype
14	10		0	0		0
15	10		0	203986	        0
16	10		151735	0		0
19	9		0	203986	        1
20	9		151735	0		1	

Simple Query:

DECLARE @per int
DECLARE @org int
SET @per = 203986
SET @org = 1517351
SELECT * FROM [voucher2contact]
WHERE 
		[perid] <> @per AND 
		[orgid] <> @org AND
		listtype = 1 

Returns one line

id	voucherid	orgid	perid	listtype
20	9	        151735	0	1

-EDIT-

This is the corrected version:

-- listtype 0 ->Whitelisted
-- listtype 1 ->Blacklisted
-- Return not Blacklisted entries for @per + @org

DECLARE @per int
DECLARE @org int
SET @per = 203986
SET @org = 151735

SELECT *
    FROM [ERA].[dbo].[voucher2contact]
    WHERE
    (
        (
            ([perid] <> @per AND [perid] > 0)
        )
        OR
        (
            ([orgid] <> @org AND [orgid] > 0)
        )
    )AND
    listtype = 1

Note to self : Do not ask stupid questions after more than 14hrs of coding ;)

THX for the help :D